Multistage purification and resource treatment equipment for tail gas of spray dryer

Abstract

The application belongs to the technical field of tail gas treatment equipment, and particularly relates to a multi-stage purification and resource treatment equipment for tail gas of a spray dryer, which comprises a spray dryer body used for drying treatment of materials, one side of the spray dryer is provided with a feeding device and an air inlet heating device used for heat treatment of the materials; and a material separation device used for separating the materials dried by the spray dryer body and water vapor. In the application, the sewage in the water scrubber and the sewage for flushing the spray dryer body can be pumped into the filter box for filtration through the sewage collecting device, and the filtered clean water can be pumped back to the water scrubber for adsorption of dust and impurities in the tail gas or for cleaning operation of the spray dryer body, so that water circulation is realized and production cost is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of exhaust gas treatment equipment, and particularly relates to a multi-stage purification and resource recovery treatment equipment for exhaust gas from spray dryers. Background Technology

[0002] A spray dryer is a drying device that transforms liquid materials (such as solutions, suspensions, emulsions, etc.) into fine droplets through an atomizing device, which then come into direct contact with hot air (or other heat medium), causing the droplets to rapidly evaporate moisture in a short time, ultimately forming a dry powder or granular product. It is widely used in food, pharmaceutical, chemical, building materials, and environmental protection industries, and features fast drying speed, uniform product quality, and continuous production capability.

[0003] Existing spray dryers generate exhaust gases containing large amounts of dust and heat during production. Direct emission of these gases not only causes environmental pollution but also wastes a significant amount of recyclable resources. Furthermore, due to the large size of the spray dryer tower, cleaning is required after production. The large amount of wastewater generated during cleaning, lacking recycling facilities, further increases production costs.

[0004] Therefore, it is necessary to invent a multi-stage purification and resource recovery treatment device for spray dryer exhaust gas to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a multi-stage purification and resource recovery treatment device for spray dryer exhaust gas, thereby resolving the issues raised in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage purification and resource recovery treatment device for spray dryer exhaust gas, comprising:

[0007] The spray dryer body is used to dry materials. A feeding device and an air heating device for heat treatment of materials are provided on one side of the spray dryer.

[0008] A material separation device is used to separate the material and water vapor after the spray dryer body is dried.

[0009] A dust removal device is used to remove dust from the air discharged from the material handling device, and a waste heat recovery device is provided between the dust removal device and the feeding device.

[0010] Wastewater collection devices are used to purify wastewater generated during the production process.

[0011] Furthermore, the feeding device includes:

[0012] A storage hopper, located at the rear of the spray dryer body, is used to store materials to be processed;

[0013] A feed pipe is connected between the storage tank and the spray dryer body;

[0014] A feed pump, installed on the feed pipe, is used to work with the feed pipe to transport materials into the spray dryer body.

[0015] Furthermore, the intake heating device includes:

[0016] A heating ventilation pipe is connected to the top of the spray dryer body;

[0017] A heater, installed on the heating ventilation duct, is used to heat the air entering the heating ventilation duct;

[0018] A first blower is connected to the bottom end of the heating ventilation pipe and is used to pump outside air into the heating ventilation pipe. An air filter is connected to the air inlet end of the first blower.

[0019] Furthermore, the material separation device includes:

[0020] A primary cyclone separator is used to coarsely separate the material and water vapor output from the spray dryer body. A first connecting pipe connects the primary cyclone separator to the spray dryer body.

[0021] A secondary cyclone separator is used to finely separate residual materials and water vapor output from the primary cyclone separator. A second connecting pipe is connected between the top end of the secondary cyclone separator and the primary cyclone separator, and a third connecting pipe is connected between the bottom end of the secondary cyclone separator and the primary cyclone separator.

[0022] A cooling dehumidifier is installed in front of the primary cyclone separator. A fourth connecting pipe is connected between the cooling dehumidifier and the bottom of the secondary cyclone separator for absorbing water vapor in the secondary cyclone separator.

[0023] Furthermore, the dust removal device includes:

[0024] A water-cooled dust collector is used to remove dust from the air output from the secondary cyclone separator.

[0025] The second blower is connected to the water-spray dust collector and is used to pump the air output from the secondary cyclone separator into the water-spray dust collector. A fifth connecting pipe connects the second blower to the secondary cyclone separator.

[0026] Furthermore, the waste heat recovery device includes:

[0027] A heat exchanger is connected to the feed pipe;

[0028] The first return pipe is connected between the top of the heat exchanger and the top of the water bath dust collector, and is used to introduce the hot gas after dust removal into the heat exchanger to heat the feed pipe.

[0029] The second return pipe is connected between the heat exchanger and the heating ventilation pipe. It is used to introduce the residual heat in the heat exchanger into the heating ventilation pipe to increase the initial temperature of the air entering the heating ventilation pipe. The connection point between the second return pipe and the heating ventilation pipe is located at the bottom of the heater.

[0030] Furthermore, the wastewater collection device includes:

[0031] A filter box is used to hold the wastewater discharged from the water-based dust collector;

[0032] A first sewage pipe is connected between the filter box and the water bath dust collector, and a first sewage pump is installed on the first sewage pipe;

[0033] A collection box is located in front of the filter box, and a connecting pipe is connected between the collection box and the filter box. A return water pipe is connected between the collection box and the tree dust collector, and a return water pump is installed on the return water pipe.

[0034] The filter assembly includes a partition, a filter plate, and a backwashing mechanism. The partition is vertically fixed in the collection tank, and the first sewage pipe is located on the side of the partition away from the collection tank. The partition has a through-hole along the front-back direction. The filter plate is circular and is rotatably installed in the mounting hole. The backwashing mechanism is located on the side of the partition near the collection tank and is used to backwash the filter plate with filtered water.

[0035] Furthermore, the backwashing mechanism includes:

[0036] An arc-shaped ring is disposed on the side of the partition plate near the collection box, and the inner side of the arc-shaped ring is hollow. The arc-shaped ring is located in the upper half of the filter plate, and a water outlet is provided on the side of the arc-shaped ring near the filter plate.

[0037] An annular surrounding plate is connected to the arc-shaped ring, and the annular surrounding plate is coaxial with the arc-shaped ring;

[0038] Water-repelling plates, wherein there are multiple water-repelling plates, and the multiple water-repelling plates are evenly distributed in a ring on the outside of the ring-shaped enclosure.

[0039] A drive shaft is inserted through the center of the filter plate, and several fixing plates are fixedly connected between the drive shaft and the annular surrounding plate.

[0040] A drive unit, installed on the top of the partition, is used to drive the drive shaft to rotate.

[0041] Furthermore, a plurality of cleaning rods are provided on the side of the partition away from the arc-shaped ring, and the cleaning rods are evenly provided with bristles on the side facing the filter plate, and the bristles can keep in close contact with the upper part of the filter plate.

[0042] Furthermore, a cleaning pipe is connected to the spray dryer body, and a second sewage pipe is connected between the spray dryer body and the filter box, and a first drain valve and a second sewage pump are installed on the second sewage pipe.

[0043] The technical effects and advantages of this invention are as follows:

[0044] This invention incorporates a wastewater collection device. During its use, wastewater from the water-washing dust collector and the wastewater used to rinse the spray dryer can be pumped into a filter box for filtration. The filtered clean water can then be pumped back into the water-washing dust collector to adsorb dust and impurities in the exhaust gas or to clean the spray dryer. This achieves water recycling while reducing production costs. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the first overall structure of the present invention;

[0046] Figure 2 This is a schematic diagram of the second overall structure of the present invention;

[0047] Figure 3 This is a three-dimensional schematic diagram of the wastewater collection device in this invention;

[0048] Figure 4 This is a three-dimensional sectional view of the filter box in this invention;

[0049] Figure 5 This is a three-dimensional schematic diagram of the arc-shaped ring, the annular surrounding plate, and the water-repellent plate in this invention.

[0050] Figure 6 This is a three-dimensional schematic diagram of the cleaning rod and brush bristles in this invention.

[0051] In the diagram: 1. Spray dryer body; 2. Storage tank; 3. Feed pipe; 4. Feed pump; 5. Heating and ventilation pipe; 6. Heater; 7. First blower; 8. Air filter; 9. Primary cyclone separator; 10. First connecting pipe; 11. Secondary cyclone separator; 12. Second connecting pipe; 13. Third connecting pipe; 14. Cooling dehumidifier; 15. Fourth connecting pipe; 16. Water bath dust collector; 17. Second blower; 18. Fifth connecting pipe; 19. Heat exchanger; 20. First return pipe; 21. Second return pipe; 22. Filter box; 23. First sewage pipe; 24. First sewage pump; 25. Collection box; 26. Connecting pipe; 27. Return water pipe; 28. Return water pump; 29. ​​Arc ring; 30. Water outlet; 31. Annular surrounding plate; 32. Water deflector plate; 33. Drive shaft; 34. Fixing plate; 35. Cleaning rod; 36. Brush bristles; 37. Cleaning pipe; 38. Second sewage pipe; 39. First drain valve; 40. Second sewage pump; 41. Second drain valve; 42. Baffle; 43. Drive belt; 44. Partition plate; 45. Filter plate; 46. Drive component. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0053] This invention provides, for example Figures 1 to 6 The multi-stage purification and resource recovery equipment for the exhaust gas of the spray dryer shown includes: a spray dryer body 1, a material separation device, a dust removal device, and a wastewater collection device. The spray dryer body 1 is used to dry materials. The spray dryer body 1 is a centrifugal spray drying tower. A feeding device and an air heating device for heat treatment of the materials are provided on one side of the spray dryer. The material separation device is used to separate the dried materials and water vapor from the spray dryer body 1. The dust removal device is used to remove dust from the air discharged from the material removal device, and a waste heat recovery device is provided between the dust removal device and the feeding device. The wastewater collection device is used to purify the wastewater generated during the production process.

[0054] The feeding device includes: a storage tank 2, a feeding pipe 3, and a feeding pump 4. The storage tank 2 is located at the rear of the spray dryer body 1 and is used to store the material to be processed. The feeding pipe 3 is connected between the storage tank 2 and the spray dryer body 1. The feeding pump 4 is installed on the feeding pipe 3 and is used to cooperate with the feeding pipe 3 to transport the material into the spray dryer body 1.

[0055] The air intake heating device includes: a heating ventilation pipe 5, a heater 6, and a first blower 7. The heating ventilation pipe 5 is connected to the top of the spray dryer body 1. The heater 6 is installed on the heating ventilation pipe 5 and is used to heat the air entering the heating ventilation pipe 5. The first blower 7 is connected to the bottom end of the heating ventilation pipe 5 and is used to pump outside air into the heating ventilation pipe 5. An air filter 8 is connected to the air intake end of the first blower 7.

[0056] The material separation device includes: a primary cyclone separator 9, a secondary cyclone separator 11, and a cooling dehumidifier 14. The primary cyclone separator 9 is used for coarse separation of the material and water vapor output from the spray dryer body 1. A first connecting pipe 10 connects the primary cyclone separator 9 to the spray dryer body 1. The secondary cyclone separator 11 is used for fine separation of the residual material and water vapor output from the primary cyclone separator 9. A second connecting pipe 12 connects the secondary cyclone separator 11 to the top of the primary cyclone separator 9, and a third connecting pipe 13 connects the secondary cyclone separator 11 to the bottom of the primary cyclone separator 9. The cooling dehumidifier 14 is located in front of the primary cyclone separator 9. A fourth connecting pipe 15 connects the cooling dehumidifier 14 to the bottom of the secondary cyclone separator 11 for absorbing water vapor in the secondary cyclone separator 11.

[0057] When the spray dryer body 1 is in use, the material to be dried is placed in the storage tank 2 and stirred to form a uniform liquid. Simultaneously, the heater 6 and the first blower 7 are started, allowing outside air to be filtered by the air filter 8 and then pumped into the spray dryer body 1 by the first blower 7. During this process, when the air comes into contact with the heater 6, it is heated. The heated air is then pumped into the spray dryer body 1. When the internal temperature of the spray dryer body 1 reaches a predetermined value, the feed pump 4 is started. At this time, the liquid is pumped into the spray dryer body 1 by the feed pump 4, and then sprayed... The dryer body 1 can disperse the liquid material into fine particles by centrifugation. When the liquid material comes into contact with the hot air inside the spray dryer body 1, the liquid material can be dried in a very short time. Then the dried material and hot steam can enter the first-stage cyclone separator 9 through the first connecting pipe 10. At this time, most of the material can be separated from the hot steam under the action of the first-stage cyclone separator 9, while the remaining material and hot steam can enter the second-stage cyclone separator 11 through the second connecting pipe 12 for secondary separation. Thus, the separation effect of the material is improved through two-stage separation. The separated exhaust gas can then enter the dust removal device for dust removal.

[0058] During the separation of materials by the primary cyclone separator 9 and the secondary cyclone separator 11, the cooling and dehumidifying machine 14 can perform cooling and dehumidifying operations on the materials separated by the primary cyclone separator 9 and the secondary cyclone separator 11 through the fourth connecting pipe 15 and the third connecting pipe 13, thereby making the materials drier.

[0059] like Figure 1 and Figure 2 As shown, the dust removal device includes: a water-spray dust collector 16 and a second blower 17. The water-spray dust collector 16 is used to remove dust from the air output from the secondary cyclone separator 11. The second blower 17 is connected to the water-spray dust collector 16 and is used to pump the air output from the secondary cyclone separator 11 into the water-spray dust collector 16. A fifth connecting pipe 18 is connected between the second blower 17 and the secondary cyclone separator 11.

[0060] The waste heat recovery device includes a heat exchanger 19, a first return pipe 20, and a second return pipe 21. The heat exchanger 19 is connected to the feed pipe 3. The first return pipe 20 is connected between the top of the heat exchanger 19 and the top of the water-cooled dust collector 16, and is used to introduce the hot air after dust removal into the heat exchanger 19 to heat the feed pipe 3. The second return pipe 21 is connected between the heat exchanger 19 and the heating ventilation pipe 5, and is used to introduce the residual heat in the heat exchanger 19 into the heating ventilation pipe 5 to increase the initial temperature of the air entering the heating ventilation pipe 5. The connection position of the second return pipe 21 and the heating ventilation pipe 5 is located at the bottom of the heater 6.

[0061] When the exhaust gas is introduced into the water bath dust collector 16 through the fifth connecting pipe 18 under the action of the second blower 17, the exhaust gas can quickly collide with the water surface inside the water bath dust collector 16 at high speed. At this time, the dust and impurities in the exhaust gas can be absorbed by the water, while the exhaust gas containing heat can flow into the heat exchanger 19 through the first return pipe 20. Subsequently, the exhaust gas carrying heat flowing through the heat exchanger 19 can heat the feed pipe 3, so that the liquid material is preheated before being transported into the spray dryer body 1 through the feed pipe 3, thereby improving the drying efficiency of the liquid material.

[0062] When the exhaust gas, which still retains residual heat, flows out of the heat exchanger 19, this portion of the exhaust gas can enter the heating ventilation pipe 5 through the second return pipe 21, thereby increasing the initial temperature of the air entering the heating ventilation pipe 5, and thus maximizing the utilization of the heat in the exhaust gas and reducing production costs.

[0063] like Figures 2 to 5As shown, the wastewater collection device includes: a filter box 22, a first sewage pipe 23, and a collection box 25. The filter box 22 is used to hold the sewage discharged from the water-spray dust collector 16. A second drain valve 41 is installed near the bottom of the filter box 22. The first sewage pipe 23 is connected between the filter box 22 and the water-spray dust collector 16, and a first sewage pump 24 is installed on the first sewage pipe 23. The collection box 25 is located in front of the filter box 22, and a connecting pipe 26 is connected between the collection box 25 and the filter box 22. A return water pipe 27 is connected between the collection box 25 and the tree dust collector, and a return water pump 28 is installed on the return water pipe 27.

[0064] The filter assembly includes a partition 44, a filter plate 45, and a backwashing mechanism. The partition 44 is vertically fixed in the collection tank 25, and the first sewage pipe 23 is located on the side of the partition 44 away from the collection tank 25. A baffle 42 is fixedly connected to the side of the partition 44 away from the collection tank 25. The side of the baffle 42 away from the partition 44 is inclined downward. The length of the baffle 42 matches the internal length of the collection tank 25. The width of the baffle 42 is less than the internal width of the collection tank 25. The highest point of the top of the baffle 42 is lower than the bottom of the filter plate 45. An installation hole is provided through the partition 44 along the front-back direction. The filter plate 45 is circular and is rotatably installed in the installation hole. The filter plate 45 has a hollow design and is filled with filter media. The backwashing mechanism is located on the side of the partition 44 near the collection tank 25 and is used to backwash the filter plate 45 with filtered water.

[0065] The backwashing mechanism includes: an arc-shaped ring 29, an annular surrounding plate 31, water-dispensing plates 32, a drive shaft 33, and a drive component 46. The arc-shaped ring 29 is located on the side of the partition plate 44 near the collection box 25, and the inner side of the arc-shaped ring 29 is hollow. The arc-shaped ring 29 is located in the upper half of the filter plate 45, and a water outlet 30 is opened on the side of the arc-shaped ring 29 near the filter plate 45. The annular surrounding plate 31 is connected to the arc-shaped ring 29, and the annular surrounding plate 31 is coaxial with the arc-shaped ring 29. There are multiple water-dispensing plates 32. Multiple water-dispensing plates 32 are evenly distributed in a ring on the outside of the annular surrounding plate 31. The length and width of the water-dispensing plates 32 are matched with the inner depth and width of the arc-shaped ring 29, respectively. The drive shaft 33 is inserted through the center of the filter plate 45, and several fixing plates 34 are fixedly connected between the drive shaft 33 and the annular surrounding plate 31. The drive component 46 is installed on the top of the partition plate 44 and is used to drive the drive shaft 33 to rotate. The drive component 46 can be a motor, and a transmission belt 43 is connected between the drive component 46 and the drive shaft 33.

[0066] A cleaning pipe 37 is connected to the spray dryer body 1, and the cleaning pipe 37 can be connected to the collection box 25, so that the clean water in the collection box 25 can be used to clean the inside of the spray dryer body 1. A second sewage pipe 38 is connected between the spray dryer body 1 and the filter box 22, and a first sewage valve 39 and a second sewage pump 40 are installed on the second sewage pipe 38.

[0067] During the process of removing dust and impurities from the exhaust gas by the water-wash dust collector 16, the water used to adsorb dust and impurities in the water-wash dust collector 16 will gradually become turbid. At this time, by setting up a wastewater collection device, after the water-wash dust collector 16 has been working for a period of time, the first sewage pump 24 can be started, so that the sewage in the water-wash dust collector 16 can be pumped into the filter box 22 through the first sewage pipe 23 to the side of the partition 44 away from the collection box 25. Then the sewage can pass through the filter plate 45. During the process of the sewage passing through the filter plate 45, the filter plate 45 can adsorb and filter the impurities in the sewage. As the water level in the filter box 22 increases, when the water level is higher than the position of the connecting pipe 26, the filtered water can flow into the collection box 25 through the connecting pipe 26. Then the return water pump 28 is started, so that the filtered clean water in the collection box 25 can flow back to the water-wash dust collector 16 through the return water pipe 27 under the action of the return water pump 28. Thus, while realizing water recycling, the normal use of the water-wash dust collector 16 is guaranteed.

[0068] Furthermore, after the spray dryer body 1 has been used, when it is necessary to rinse the spray dryer body 1, the cleaning pipe 37 can be connected to the collection box 25, so that the cleaning pipe 37 can spray clean water into the spray dryer body 1, thereby cleaning the inside of the spray dryer body 1. During the cleaning process, the first drain valve 39 and the second sewage pump 40 can be opened, so that the sewage after cleaning the spray dryer body 1 can be transported to the filter box 22 through the second sewage pipe 38, thereby performing the above-mentioned filtration operation, thereby achieving filtration and circulation of the sewage after cleaning, and reducing production costs.

[0069] In addition, as the filter plate 45 continues to filter the sewage, it may become clogged by impurities in the sewage. In this case, a backwashing mechanism is provided. When backwashing the filter plate 45, the drive unit 46 is activated, which drives the drive shaft 33 to rotate via the transmission belt 43. As the drive shaft 33 rotates, it can drive the filter plate 45 and the annular surrounding plate 31 to rotate together, so that the part of the filter plate 45 submerged in water can be changed continuously, thereby ensuring that the entire filter plate 45 can filter the sewage evenly.

[0070] During the rotation of the annular enclosure 31, the water-dispelling plate 32 can move together with the annular enclosure 31. When the water-dispelling plate 32 enters the inner area of ​​the arc-shaped ring 29 under the drive of the annular enclosure 31, the water-dispelling plate 32 can cooperate with the water-dispelling plate 32, the annular enclosure 31 and the arc-shaped plate adjacent to it in the direction of movement to seal the water entering the inner side of the arc-shaped ring 29. Subsequently, as the annular enclosure 31 continues to rotate, when the water moves to the position of the water outlet 30 under the drive of the water-dispelling plate 32, the clean water can backwash the filter plate 45 through the water outlet 30, thereby preventing the filter plate 45 from being blocked by impurities in the sewage.

[0071] Furthermore, by providing baffle 42, when sewage is introduced into the filter box 22, larger particles of impurities can slide down the top slope of baffle 42 to the bottom area of ​​baffle 42 under the action of gravity, thereby allowing larger particles of impurities to settle better in the bottom area of ​​baffle 42 and preventing large particles of impurities from clogging the filter plate 45; after the filter box 22 has been filtering for a period of time, the second drain valve 41 can be opened to discharge the turbid sewage through the second drain valve 41, thereby cleaning the filter box 22.

[0072] like Figure 4 and Figure 6 As shown, a number of cleaning rods 35 are provided on the side of the partition plate 44 away from the arc ring 29. The cleaning rods 35 are evenly provided with bristles 36 on the side facing the filter plate 45, and the bristles 36 can keep in close contact with the upper part of the filter plate 45.

[0073] With the cleaning rod 35 and brush bristles 36 installed, the brush bristles 36 on the cleaning rod 35 can brush against the filter plate 45 during the rotation of the filter plate 45, thereby working with the clean water flowing out of the water outlet 30 to better clean the impurities attached to the filter plate 45 and ensure the filtration effect of the filter plate 45.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A multi-stage purification and resource treatment equipment for tail gas of a spray dryer, characterized in that, The utility model relates to a kind of spray dryer, including: Spray dryer body (1) is used to dry material, and the side of spray dryer is provided with feeding device and air heating device for heat treatment to material; Material separation device is used to separate material and water vapor after drying in spray dryer body (1); Dust removal device is used to carry out dust removal operation to air discharged from material device, and waste heat recovery device is arranged between dust removal device and feeding device; Waste water collecting device is used to purify waste water generated in production process; Waste water collecting device includes: Filter box (22) is used to store sewage discharged from water scrubber (16); First sewage pipe (23) is connected between filter box (22) and water scrubber (16), and first sewage pump (24) is installed on first sewage pipe (23); Collecting box (25) is arranged on the front side of filter box (22), and connecting pipe (26) is connected between collecting box (25) and filter box (22), and backwater pipe (27) is connected between collecting box (25) and water scrubber, and backwater pump (28) is installed on backwater pipe (27); Filter assembly includes baffle (44), filter plate (45) and backwashing mechanism, baffle (44) is vertically fixedly connected in collecting box (25), and first sewage pipe (23) is located on the side of baffle (44) away from collecting box (25), mounting hole is provided in baffle (44) in front-rear direction, filter plate (45) is circular, and filter plate (45) is rotatably installed in mounting hole, backwashing mechanism is arranged on the side of baffle (44) close to collecting box (25), for backwashing filter plate (45) using filtered water; Backwashing mechanism includes: Arc ring (29) is arranged on the side of baffle (44) close to collecting box (25), and the inside of arc ring (29) is hollow design, arc ring (29) is located in the upper half of filter plate (45), and water outlet hole (30) is arranged on the side of arc ring (29) close to filter plate (45); Annular fence (31) is connected to arc ring (29), and annular fence (31) is coaxial with arc ring (29); Water deflector (32) is a plurality of, and a plurality of water deflectors (32) are evenly annularly distributed on the outside of annular fence (31); Driving shaft (33) is inserted through the axis of filter plate (45), and a plurality of fixed plates (34) are fixedly connected between driving shaft (33) and annular fence (31); Driving member (46) is installed on the top of baffle (44), for driving driving shaft (33) to rotate; A plurality of cleaning rods (35) are arranged on the side of baffle (44) away from arc ring (29), and a plurality of bristles (36) are evenly arranged on the side of cleaning rod (35) opposite to filter plate (45), and bristle (36) can be attached to the upper half of filter plate (45).

2. The spray drier tail gas multi-stage cleaning and valorization plant according to claim 1, characterized in that, Feeding device includes: Storage barrel (2) is arranged on the back side of spray dryer body (1), for storing material to be processed; Feeding pipe (3) is connected between storage barrel (2) and spray dryer body (1). A feed pump (4) is installed on the feed pipe (3) and used to cooperate with the feed pipe (3) to deliver the material into the spray dryer body (1).

3. The spray drier tail gas multi-stage cleaning and valorization plant according to claim 2, characterized in that, The air inlet heating device comprises: A heating ventilation pipe (5) is connected to the top of the spray dryer body (1); A heater (6) is installed on the heating ventilation pipe (5) and used to heat the air entering the heating ventilation pipe (5); A first air blower (7) is connected to the bottom end of the heating ventilation pipe (5) and used to pump the external air into the heating ventilation pipe (5), and the air inlet end of the first air blower (7) is connected with an air filter (8).

4. The spray drier tail gas multi-stage cleaning and valorization plant according to claim 3, characterized in that, The material separation device comprises: A first cyclone separator (9) is used to coarsely separate the material and water vapor output from the spray dryer body (1), and a first connecting pipe (10) is connected between the first cyclone separator (9) and the spray dryer body (1); A second cyclone separator (11) is used to finely separate the residual material and water vapor output from the first cyclone separator (9), a second connecting pipe (12) is connected between the second cyclone separator (11) and the top end of the first cyclone separator (9), and a third connecting pipe (13) is connected between the second cyclone separator (11) and the bottom end of the first cyclone separator (9); A cooling dehumidifier (14) is arranged on the front side of the first cyclone separator (9), a fourth connecting pipe (15) is connected between the cooling dehumidifier (14) and the bottom end of the second cyclone separator (11), and the cooling dehumidifier (14) is used to absorb the water vapor in the second cyclone separator (11).

5. The spray drier tail gas multi-stage cleaning and valorization plant according to claim 4, characterized in that, The dust removal device comprises: A water bath dust collector (16) is used to remove dust from the air output from the second cyclone separator (11); A second air blower (17) is connected to the water bath dust collector (16) and used to pump the air output from the second cyclone separator (11) into the water bath dust collector (16), and a fifth connecting pipe (18) is connected between the second air blower (17) and the second cyclone separator (11).

6. The spray drier tail gas multi-stage cleaning and valorization plant according to claim 5, characterized in that, The waste heat recovery device comprises: A heat exchanger (19) is connected to the feed pipe (3); A first return pipe (20) is connected between the heat exchanger (19) and the top end of the water bath dust collector (16) and used to guide the hot air after dust removal into the heat exchanger (19) to heat the feed pipe (3); A second return pipe (21) is connected between the heat exchanger (19) and the heating ventilation pipe (5) and used to guide the residual heat in the heat exchanger (19) into the heating ventilation pipe (5) to increase the initial temperature of the air entering the heating ventilation pipe (5), and the connection position of the second return pipe (21) and the heating ventilation pipe (5) is located at the bottom of the heater (6).

7. The spray drier tail gas multi-stage cleaning and valorization plant according to claim 1, characterized in that, A cleaning pipe (37) is connected to the spray dryer body (1), a second sewage pipe (38) is connected between the spray dryer body (1) and the filter box (22), and a first sewage valve (39) and a second sewage pump (40) are installed on the second sewage pipe (38).

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